Washing device for test tubes



FIG. 1 is a perspective view of a washing device for test tubes, showing my new design;

FIG. 2 is a perspective view taken from the opposite side thereof;

FIG. 3 is a perspective view thereof with the limbs shown in a first alternate position; and

FIG. 4 is a perspective view thereof with the limbs shown in a second alternate position. 

The ornamental design for a washing device for test tubes, as shown and described. 